Hi
> On May 19, 2018, at 11:22 AM, Dana Whitlow <k8yumdoo...@gmail.com> wrote: > > Don't Cesium clocks have a beam current integrator of sorts so that it's > possible > to pretty accurately assess the remaining life of the tube? If not, I'm > terribly Simple answer - no. The ones we are playing with came out *long* before you could do anything like that in a practical way. Even today I know of no atomic standard made by anybody that does something like that. > surprised and disappointed. > > Also, beginning with a new tube, roughly how long can one be run until it > reaches exhaustion? Are we speaking months, years, decades, or what? Rated life on a high performance tube is in the 5 to 7 year range. I have indeed proven that to be correct with a couple of tubes run on a 24/7/365 basis. A “standard grade” tube should run for 2 or 3 times that long. A lot depends on exactly which model tube from what era and who made the specific tube. Tubes are not the only thing that dies in a Cs standard. The older ones ( = what we play with) are mostly full of leaded parts described in manuals and schematics. They may not all be made anymore, but various substitutes are out there. Also, chassis for Cs standards with dead tubes are pretty common. It’s the tubes we are most likely to run out of …. Of course you *can* get a nice new tube from the factory. Last time I did that the bill was about $38,000. That included them putting it in. Bob > > Dana > > > On Sat, May 19, 2018 at 10:01 AM, Bob kb8tq <kb...@n1k.org> wrote: > >> Hi >> >> Unfortunately there really is no way to tell how much Cs is left in the >> tube. You can >> look at beam current and make a guess. All that really will tell you is >> that the fuel >> gauge is on empty or at least just off of empty. >> >> Bob >> >>> On May 19, 2018, at 2:30 AM, Paul Bicknell <p...@bicknells.f2s.com> >> wrote: >>> >>> Hi Doug >>> >>> Is it possible to test its operation and >>> can the time left on the cesium be calculated Regards Paul >>> >>> -----Original Message----- >>> From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Doug >> Millar >>> via time-nuts >>> Sent: 19 May 2018 05:04 >>> To: time-nuts@febo.com >>> Subject: [time-nuts] Cesium Clock Avialable >>> >>> Hi, I am willing to part with my HP 5061A cesium standard and manual. The >>> unit was rebuilt and functioning some years ago and not used since then. >>> There is usable cesium in the tube and the unit worked. I have not >> tested it >>> recently. It has a Patek-Philippe analogue clock in the front. The unit >> is >>> in great physical condition. Asking $600 plus shipping from Long Beach, >> CA. >>> 90806 >>> I also have an ESI 242D resistance calibrator and a Julie primary >> resistance >>> standard in an oven. Let me know if you are interested. Very reasonable. >>> Thanks, Doug K6JEY >>> _______________________________________________ >>> time-nuts mailing list -- time-nuts@febo.com >>> To unsubscribe, go to >>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>> and follow the instructions there. >>> >>> >>> ----- >>> No virus found in this message. >>> Checked by AVG - www.avg.com >>> Version: 2016.0.8048 / Virus Database: 4793/15670 - Release Date: >> 05/19/18 >>> >>> _______________________________________________ >>> time-nuts mailing list -- time-nuts@febo.com >>> To unsubscribe, go to https://www.febo.com/cgi-bin/ >> mailman/listinfo/time-nuts >>> and follow the instructions there. >> >> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to https://www.febo.com/cgi-bin/ >> mailman/listinfo/time-nuts >> and follow the instructions there. >> > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
